Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Slenderness Ratio Distributions and Average Compressive Strengths of Stiffened Plates Used for In-Service Vessels

실선 보강판의 세장비 분포 및 평균 압축 강도 비교 연구

  • Nam, Ji-Myung (Dep't of Naval Architecture and Ocean Engineering, Inha University) ;
  • Choung, Joon-Mo (Dep't of Naval Architecture and Ocean Engineering, Inha University) ;
  • Jeon, Sang-Ik (Dep't of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Min-Seong (Dep't of Naval Architecture and Ocean Engineering, Inha University) ;
  • Ha, Tae-Bum (Research and Development Center, Korean Register of Shipping)
  • 남지명 (인하대학교 조선해양공학과) ;
  • 정준모 (인하대학교 조선해양공학과) ;
  • 전상익 (인하대학교 조선해양공학과) ;
  • 이민성 (인하대학교 조선해양공학과) ;
  • 하태범 (한국선급 기술연구소)
  • Received : 2010.07.16
  • Accepted : 2010.09.15
  • Published : 2010.10.20
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Abstract

This paper deals with two contents: first, distributions of plate slenderness ratios, stiffened plate slenderness ratios, and stiffener slenderness ratios, which include dimensions and material variables of stiffened plates, of stiffened plates of large-sized in-service vessels, and, second, comparison of compressive strengths. The investigated vessels consist of 59 tankers, 49 bulkers, 28 product carriers, 15 container carriers, and 12 multi-purpose vessels. The tankers are ranged from handymax class to VLCC and larger than Suezmax class. The sizes of the bulkers are 20K to 200K deadweight. The maximum size of containers is less than 5000TEU class. Two parameters for normal distributions of the slenderness ratios (mean and standard deviation) are suggested and probable ranges of the slenderness ratios are also graphically presented. The ultimate strengths of the stiffened plates are presented using the various simplified formulas and nonlinear FEAs. As well, average compressive strength curves, which are necessary for the estimation of the hull girder moment capacities, are proposed. It is proved that formulas for stiffened plates in CSR overestimate slightly in overall average strain range. Mode5 formula (plate buckling mode) in CSR show unreasonably conservative results with respect to the ultimate strengths rather than post-ultimate average compressive strengths.

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References

  1. Caldwell, J.B., 1965. Ultimate longitudinal strength. RINA Transactions, 107, pp.411-430.
  2. Cho, S.R. Choi, B.W. & Song, I.C., 1998. Post-Ultimate Behaviour of StiffenedPanels subjected to Axial Compression. 2nd International Conference on Thin-Walled Structures, pp.433-440.
  3. International Association of Classification Societies (IACS), 2010a. Common Structural Rules for Bulk Carriers. [Online] (Updated July 2010) Available at: http://www.iacs-data.org.uk/ [Accessed August 2010].
  4. International Association of Classification Societies (IACS), 2010a. Common Structural Rules for Double Hull Oil Tankers. [Online] (Updated July 2010) Available at: http://www.iacs-data.org.uk/ [Accessed August 2010].
  5. Kim, O.H., 1997. Reliability Assessment of Ship Longitudinal Strength for the Rational Ship Structural Design. Ph.D Dissertation, Ulsan Univesrity.
  6. Lee, J.S, 1989. Reliability Analysis of Continuous Structural System. Ph.D Dissertation, University of Glasgow, Scotland.
  7. Lee, J.S. & Yang, P.D.C., 1992. Reliability Assessment against Ultimate Bending Momentof Ships' Hull Girder. Journal of the Society of Naval Architects of Korea, 29(1), pp.103-112.
  8. Lin, Y.T., 1985. Ship Longitudinal Strength. Ph.D. Dissertation, University of Glasgow, Scotland.
  9. Paik, J.K. & Kim, B.J., 2002. Ultimate Strength Formulations for Stiffened Panels under Combined Axial Load, In-Plane Bending and Lateral Pressure: a Benchmark Study. Thin-Walled Structures, 40(1), pp.45-83. https://doi.org/10.1016/S0263-8231(01)00043-X
  10. Paik, J.K. & Thayamballi, A.K., 2002. Ultimate Limit State Design of Steel-Plated Structures. Wiley, Chichester, UK.
  11. Paik, J.K. Kim, B.J. & Seo, J.K., 2008. Methods for Ultimate Limit State Assessment of Ships and Ship-Shaped Offshore Structures: Part II stiffened panels. Ocean Engineering, 35(2), pp.271-280. https://doi.org/10.1016/j.oceaneng.2007.08.007
  12. Park, J.S. Ko, J.Y. & Oh, Y.C., 2007. Estimation of Buckling and Plastic Behaviour according to theAnalysis Model of the Stiffened Plate. Joumal of Korean Navigation and Port Research, 31(3), pp.271-279. https://doi.org/10.5394/KINPR.2007.31.3.271
  13. Qi, E. Cui, W. & Wan, Z., 2005. Comparative Study of Ultimate Hull Girder Strength of Large Double Hull Tankers. Marine Structures, 18(3), pp.227-249. https://doi.org/10.1016/j.marstruc.2005.11.002
  14. Smith, C.S. Davidson, P.C.,Chapman, J.C. and Dowling, P.J., 1988. Strength and Stiffness of Ships' Plating under In-plane Compression and Tension. RINA Transactions, 130, pp.277-296.
  15. Smith, C.S., 1977. Influence of Local Compression Failure on Ultimate Longitudinal Strength of a Ship Hull. Proc. of International Symposium on Practical Design in Shipbuilding (PRADS), 18-20 October, Tokyo Japan, pp.73-79.
  16. Ueda, Y. & Rashed, S.M.H., 1984. The Idealized Structural Unit Method and Its Application to Deep Girder Structures. Computers & Structures, 18(2), pp.227-293. https://doi.org/10.1016/0045-7949(84)90126-3